X100管线钢的热轧显微组织分析

来源期刊：钢铁2010年第9期

论文作者：周平 兰亮云 邱春林 霍孝新 高秀华 刘相华

文章页码：77 - 81

关键词：X100； 管线钢； 针状铁素体； 控轧控冷

Key words：X100； pipeline steel； acicular ferrite； thermomechanical control process(TMCP)

摘    要：通过热轧试验,利用扫描电镜,TEM观察和EBSD技术等分析显微组织与力学性能之间的关系。研究结果表明:显微组织以GB+AF组织为主,AF组织呈典型的长条针状;以块状形式转变的准多边形铁素体为主,内部含有大量位错,高位错密度形成位错胞,位错线上分布着细小的析出相,具有高强度和良好冲击韧性;大角度晶界占整个分析区域内晶界的88%,大角度晶界主要分布在30°~60°,对冲击韧性非常有利。

Abstract: The relationship between microstructure and mechanical properties were investigated through hot-rolling tests,scanning electron microscopy,TEM observation and analysis of EBSD technology.The results show that GB+AF are the primary microstructures,and AF is typical of long needle-like structure.the quasi-polygonal ferrite transformed from massive ferrite is the main structure,containing a lot of interior dislocation and further forming the high dislocation density of dislocations cell,and distributing small precipitates in dislocation lines with high strength and good impact toughness.The wide-angle grain boundary is about 88% of the total grain boundary observed,wide-angle grain boundary are mainly distributed in 30°-60°,which is very beneficial to toughness.